Airplane's black boxes are deliberately designed to survive worst-case scenarios. This is due to their design and materials — all rigorously tested.

The Air India flight crash report said that both engines lost thrust shortly after takeoff because the aircraft’s fuel control switches had been turned off.

A preliminary finding into last month’s Air India plane crash has suggested the aircraft’s fuel control switches were turned off, starving the engines of fuel and causing a loss of engine thrust shortly after takeoff.